Compact zoom lens

ABSTRACT

Particular lens parameters are provided which give good corrections in a high aperture, wide-angle zoom lens which has a positive power zoom portion and a strong fourth surface. The zoom lens has a minimal number of elements and is compact in both length and diameter.

Unlted States Patent [151 3,697,155

Ruben [451 Oct. 10, 1972 COMPACT ZOOM LENS 3,044,355 7/1962 Cox et a1. ..350/ 186 72 Inventor: Paul In Ruben, Pent-181d N Y 3,059,536 10/1962 COX 6t 81. .'350/] 86 [73] Assignee: Eastman Kodak Company, Primary Examiner-John K. Corbin Rochester. -Y- AttorneyW. H. .I. Kline et a1.

21 A N :2 2,7l97l [57] ABSTRACT 1 pp Particular lens parameters are provided which give good corrections in a high aperture, wide-angle zoom [52] [1.8. CI ..350/184, 350/214 lens which has a positive power zoom portion and a [51] Int. Cl. ..G02b 15/16 strong fourth surface. The zoom lens has a minimal [58] Field of Search ..350/l84, 186 number of elements and is compact in both length and diameter.

[56] References Cited UNITED STATES PATENTS 5 Claims, 5 Drawing Figures 3,000,259 9/1961 Turula et a]. 350/186 PATENTEDHBI I0 3 697. 155

sum 1 or 3 PAUL L. RUBEN INVENTOR.

BY MJWM ATTORNEY a AGENT PATENTED I 10 I 3.697. 1 55 sum 2 or 3 PAUL L. RUBEN INVENTOR.

ATTORNEY 8: AGENT PATENTEDUBI 10 I972 3,697, l 55 SHEET 3 BF 3 PAUL L. RUBEN INVENTOR.

ATTORNEY 8 AGENT comacr zoom LENS BACKGROUND OF THE INVENTION I Field of the Invention This invention relates to zoom lenses and in particu- Emblem lar to a zoom lens suitable for use as a motion picture camera lens at apertures as wide as f/ l .2.

2. Description of the Prior Art Most prior art zoom lenses, particularly wide aperture lenses used in motion picture cameras, are of relatively complex construction and require a large number of lens elements. This is objectionable for two reasons. First, the large number of lens elements makes the zoom lens relatively expensive to produce because of the cost of the glass and manufacturing of each individual element. Second, the large number of elements requires a large amount of space to provide adequate room for relative movement of the lens components.

SUMMARY OF THE INVENTION It is an object of this invention to provide a zoom lens capable of substantially improved optical performance at apertures as wide as f/ I .2.

It is another object of this invention to provide such a zoom lens which is composed of relatively few elements and which is compact both in length and diameter.

These and other objects are accomplished according to this invention by zoom lenses designed according to parameters to be set forth more fully in the detailed description of the preferred embodiments presented below.

BRIEF DESCRIPTION OF THE DRAWINGS In the detailed description of the preferred embodiments of the invention presented below, reference is made to the accompanying drawings in which FIGS. 1-5 are diagrammatic axial cross sections of zoom lenses made according to this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT For all purposes of describing or claiming of the invention herein, the term lens shall be used to describe the complete lens and not elements or components thereof. The long conjugate side of the lens is considered the front. The lens components are numbered from front to rear with Roman numerals; the lens elements are numbered from front to rear with Arabic numerals; F is the focal length of the lens; the indexes of refraction N are for the D line of the spectrum; the dispersive indexes V, the radii of curvature R, the thickness T and the separations S are numbered by subscript from front to rear. Radii of curvature having centers of curvature to the rear of the surface are considered positive; those with centers of curvature to the front of the surface are considered negative.

In all figures, component I is positive and is moved, it at all, only for focusing. Components II and III are negative and positive, respectively, and are moved in opposite directions for zooming in a non-linear fashion, except at the extreme long focal length end of the zoom range where they move in the same direction. Component IV is a stationary positive relay.

Well corrected zoom lenses may be made according to this Invention by following the specifications In the examples below. In all examples. the geometric mean between the wide angle and telephoto focal lengths is EXAMPLE 1 (FIG. I)

EJ. from 65.9mm to lSlmm (".2 ell Radius Thickaealor ment N,-N. V -V, mm. Separatlommm.

It,- 203.03 1 N,-I.6ll00V,-$8.8 t 50.95

Rg-J'llll S,- 85328 to 9.944 R l$7.72 2 N LSHOO VH4 t.- l9."

8,- 69.007 lip-327. 3 N,-1.snoov,-64.s q- 14.51

201.7l R,- 169.05 4 N,-L696l0 V 562 t 42.32

1t,-1oe.74 S N -L689.0 Ii -30.9 t,- l3.l9

it,-45o.15

$6.6 a 95.529 6 Npl.6l700 V -54.9 I.- ll."

s. 9.91: R,,--79.090 1 Ni-l.6l700 V -36.6 t,- 7.254

8,- 7.122 lt -225.76 8 N L6IIOO V -58.8 l 23.48

5,- 0.659 Im- 66.290 9 Ny-Lfil I00 Vg-SBJ t.- 30.96

The length of the lens of Example 1 is 625.58mm. The strong fourth surface is an aid in correcting for distortion and in obtaining the wide field coverage available, with a semifield range from 8.9 to 19.7. The zoom portion, components II and ill, has positive power and thus presents a converging beam to the fixed relay component IV. This assists in obtaining the necessary back focus for component IV.

EXAMPLE 2 (FIG. 2)

Example ll is essentially the same as Example I. The length of the lens of this example is 448.50mm.

EXAMPLE 3 (FIG. 3)

Example 3 is similar to Example I and 2, except for the addition of a third negative element in component ll. The length of this lens is 544.80mm while the effective focal length range has been changed to 65.4 to 153mm.

EXAMPLE 4 (FIG. 4)

Example 4 is similar to Example 3, except for element 4 which has been changed to a meniscus form rather than the positive form of Example 3. The length of this lens is 625.58mm.

EXAMPLE 5 (FIG. 5)

Example 5 is similar to Example 4, except that the first element has been strengthened and changed to a meniscus form rather than the convex-plane shape of element 1 of Example 4. The length of the lens of this example is 626.4lmm.

The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be efi'ected within the spirit and scope of the invention.

lclaim:

l. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-9, the indexes of refraction for the D line of the spectrum are numbered from N, to N,,, the dispersive indexes are numbered from V, to V the radii are numbered from R, to R11, the thicknesses are numbered from T, to T, and the air spaces are numbered from S, to S 2. A zoom lens having a front zoom portion and a rear relay portion said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-9, the indexes of refraction for the D line of the spectrum are numbered from N, to N the dispersive indexes are numbered from V, to V,,, the radii are numbered from R, to R the thicknesses are numbered from T, to T, and the air spaces are numbered from S, to 8,:

3. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N, to N the dispersive indexes are numbered from V, to V,,,, the radii are numbered from R, to R the thicknesses are numbered from T, to T,,, and the air spaces are numbered from S, to 8,:

4. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N, to N,,,, the dispersive indexes are numbered from V, to V,,,, the radii are numbered from R, to R the thicknesses are numbered from '1, to T,,, and the air spaces are numbered from S, to 8,:

E. F. 65.4 to 153 f/l.2

Thicknessor ele- N,-N V -V Radius seplration, mam mm. mm.

Il -L52 l N,-l.6ll V,-58.8 t -47.28

R Plano 18.78 Rf226-3l 2 N,-l.5l700 V,-64.5 t,-20.37

5,-6337 lip-207.58 3 N,-LI700 Vg-64.5 5-14.55

8 -3654 lip-309.62 4 ti -1.7200 V 293 tg-2L82 lip-180.82

210.29 R,-163.46 5 N,-l.69680 V,==56.2 t -$6.93

R -102.81 6 N,=L68900 V -30.9 t.-l3.09

R -Sl43A Sg-H0.02to

19.91 R, -70.743 7 N -l.6l700 V 54!) t -29.24

R IQSA'I S -6.91l the-408.73 8 N,=l.6l700 V,=36.6 t -8.002

-S,23.55 R =l36.23 9 N,=l.6ll00 V,=58.8 t.=-17.08

8 -328 Bt -55,259 l0 N wl.6l100V ==58.8 t ,-l7.l4

5. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N to N the dispersive indexes are numbered from V, to V the radii are numbered from R, to R the thicknesses are numbered from T to T and the air spaces are numbered from S to 5.:

BF. 65.4 to I53 fll.2

ele- N -N V,-V., Radius Thicknessor ment mm. separation, mm

Il -M238 l N,-L6ll00 I -58.8 T-45.83

R,-52l4.l

S-l06.56to

I033 Ri -260.18 2 Nr-LSHOO Vg-645 Tr-20.37

Sr6l.30 R,-209.B2 3 N,-L5l700 V,- 64.5 T,-l4.5$

5,-4496 ti -266.71 4 hi -1.72000 V.-29.3 T.2l.82

S.-ll.33 to 200.84 lt -174.10 S lie-1.69680 V,-56.2 T.=59.82

E r-103.30 6 N L68900 V -30.9 T -IJ.O9

S,-l24.063 to 30.58 R.,=69.879 I N,-l.6l700 V -54.9 H -32.26

li y-199.61

8. 6.896 8 N,,-L6l700 V -36.6 R =399.40 T =8.002

ll,,=56.558 5,-2.7! 9 N -1.6|l00 V =58.8 R, =l34.09 T,-l6.62 v S=J274 R -l69.89 l0 N, -l.6ll00 V,,-58.8 13515.50

R -ISS.SS R,,-82.30I

i i i i 0 

1. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-9, the indexes of refraction for the D line of the spectrum are numbered from N1 to N9, the dispersive indexes are numbered from V1 to V9, the radii are numbered from R1 to R17, the thicknesses are numbered from T1 to T9 and the air spaces are numbered from S1 to S7: E.F. from 65.9mm to 151mm f/1.2 ele- Radius Thickness or ment N1-N9 V1-V9 mm. separation, mm. R1 283.03 1 N1 1.61100 V1 58.8 t1 50.95 R2 3712.8 S1 85.928 to 9.944 R3 157.72 2 N2 1.51700 V2 64.5 t2 19.78 R4 78.602 S2 69.007 R5 -327.81 3 N3 1.51700 V3 64.5 t3 14.51 R6 298.17 S3 62.26 to 207.71 R7 169.05 4 N4 1.69680 V4 56.2 t4 42.32 R8 -106.74 5 N5 1.689.0 V5 30.9 t5 13.19 R9 -456.15 S4 126.15 to 56.69 R10 95.529 6 N6 1.61700 V6 54.9 t6-11.72 R11 461.94 S5 9.918 R12 -79.090 7 N7 1.61700 V7 36.6 t7 7.254 R13 94.203 S6 7.122 R14 225.76 8 N8 1.61100 V8 58.8 t8 23.48 R15 69.152 S7 0.659 R16 66.290 9 N9 1.61100 V9 58.8 t9 30.96 R17 104.87
 2. A zoom lens having a front zoom portion and a rear relay portion said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-9, the indexes of refraction for the D line of the spectrum are numbered from N1 to N9, the dispersive indexes are numbered from V1 to V9, the radii are numbered from R1 to R17, the thicknesses are numbered from T1 to T9 and the air spaces are numbered from S1 to S7: E.F. from 65.9mm to 151mm f/1.2 ele- N1-N9 V1-V9 Radius Thickness or ment mm. Separation, mm R1 261.25 1 N1 1.61100 V1 58.8 t1 39.03 R2 plano S1 83.389 to 18.46 R3 237.00 2 N2 1.51700 V2 64.5 t2 18.46 R4 71.533 S2 51.84 R5 -146.33 3 N3 1.51700 V3 64.5 t3 13.18 R6 -395.55 S3 15.70 to 144.00 R7 131.76 4 N4 1.69680 V4 56.2 t4 42.96 R8 -99.709 R9 -586.31 5 N5 1.68900 V5 30.9 t5 11.86 R10 90.425 S4 80.751 to 17.38 R11 421.57 6 N6 1.61700 V6 54.9 t6 12.28 R12 -98.628 S5 8.895 R13 81.54 7 N7 1.61700 V7 36.6 t7 7.254 R14 213.44 S6 6.845 R15 -76.571 8 N8 1.61100 V8 58.8 t8 27.65 R16 65.220 S7 0.6594 R17 101.93 9 N9 1.61100 V9 58.8 t9 27.72
 3. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N1 to N10, the dispersive indexes are numbered from V1 to V10, the radii are Numbered from R1 to R19, the thicknesses are numbered from T1 to T10 and the air spaces are numbered from S1 to S8: E.F. 65.4 to 153 f/1.2 ele- N1-N10 V1-V10 Radius Thickness or ment mm. separation, mm 1 N1 1.61100 V1 58.8 R1 319.53 t1 43.38 R2 Plano S1 93.046 to 11.68 2 N2 1.51700 V2 64.5 R3 246.02 t2 20.37 R4 85.393 S2 55.42 3 N3 1.51700 V3 64.5 R5 -247.49 t3 14.55 R6 203.83 S3 17.09 4 N4 1.72000 V4 29.3 R7 740.58 t4 21.82 R8 -740.58 S4 11.58 to 171.02 5 N5 1.69680 V5 56.2 R9 154.96 t5 56.14 R10 -91.263 t6 13.09 6 N6 1.68900 V6 30.9 R11 -741.76 S5 97.032 to 18.95 R12 85.393 t7 17.65 7 N7 1.61700 V7 54.9 R13 361.23 S6 8.198 8 N8 1.61700 V8 36.6 R14 -146.61 t8 8.002 R15 72.606 S7 21.65 9 N9 1.61100 V9 58.8 R16 219.12 t9 19.60 R17 -94.195 S8 .7274 10 N10 1.61100 V10 58.8 R18 64.994 t10 25.45 R19 94.195
 4. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N1 to N10, the dispersive indexes are numbered from V1 to V10, the radii are numbered from R1 to R19, the thicknesses are numbered from T1 to T10 and the air spaces are numbered from S1 to S8: E. F. 65.4 to 153 f/1.2 Thickness or ele- N1-N10 V1-V10 Radius separation, ment mm. mm. R1 381.52 1 N1 1.61100 V1 58.8 t1 47.28 R2 Plano S1 127.23 to 18.78 R3 226.31 2 N2 1.51700 V2 64.5 t2 20.37 R4 89.241 S2 63.37 R5 -207.58 3 N3 1.51700 V3 64.5 t3 14.55 R6 314.49 S3 36.54 R7 -309.62 4 N4 1.7200 V4 29.3 t4 21.82 R8 -180.82 S4 11.73 to 210.29 R9 163.46 5 N5 1.69680 V5 56.2 t5 56.93 R10 -102.81 6 N6 1.68900 V6 30.9 t6 13.09 R11 5143.4 S5 110.02 to 19.91 R12 70.743 7 N7 1.61700 V7 54.9 t7 29.24 R13 195.47 S6 6.911 R14 -408.73 8 N8 1.61700 V8 36.6 t8 8.002 R15 57.630 S7 23.55 R16 136.23 9 N9 1.61100 V9 58.8 t9 17.08 R17 -156.47 S8 .728 R18 55.259 10 N10 1.61100 V10 58.8 t10 17.14 R19 79.865
 5. A zoom lens having a front zoom portion and a rear relay portion, said zoom portion having a front fixed positive component, a middle movable negative component and a rear movable positive component, said zoom lens being constructed according to the following table wherein, from front to rear, the lens elements are numbered from 1-10, the indexes of refraction for the D line of the spectrum are numbered from N1 to N10, the dispersive indexes are numbered from V1 to V10, the radii are numbered from R1 to R19, the thicknesses are numbered from T1 to T10 and the air spaces are numbered from S1 to S8: E.F. 65.4 to 153 f/1.2 ele- N1-N10 V1-V10 Radius Thickness or ment mm. separation, mm R1 312.88 1 N1 1.61100 V1 58.8 T 45.83 R2 5214.1 S 106.56 to 10.53 R3 260.18 2 N2 1.51700 V2 64.5 T2 20.37 R4 86.404 S2 61.30 R5 -209.82 3 N3 1.51700 V3 64.5 T3 14.55 R6 326.58 S3 44.96 R7 -266.71 4 N4 1.72000 V4 29.3 T4 21.82 R8 -172.50 S4 11.33 to 200.84 R9 174.10 5 N5 1.69680 V5 56.2 T5 59.82 R10 -103.30 6 N6 1.68900 V6 30.9 T6 13.09 R11 -8705.2 S5 124.063 to 30.58 R12 69.879 7 N7 1.61700 V7 54.9 T7 32.26 R13 199.61 S6 6.896 8 N8 1.61700 V8 36.6 R14 -399.40 T8 8.002 R15 56.558 S7 22.71 9 N9 1.61100 V9 58.8 R16 134.09 T9 16.62 S8 .7274 R17 -169.89 10 N10 1.61100 V10 58.8 T10 15.50 R18 155.58 R19 82.301 